Long-Term Debt (Details) - USD ($) $ in Thousands		3 Months Ended
	Dec. 23, 2016	Mar. 31, 2017
Debt Instrument [Line Items]
Amortization of debt issuance costs		$ 147
NY Green Bank
Debt Instrument [Line Items]
Loan Amount	$ 25,000
Long-term borrowings	25,000	$ 25,000
Debt issuance costs	$ 1,200
Interest rate spread (as a percent)	6.00%
Effective interest rate (as a percent)		11.30%
Term of loan agreement	3 years
2017		$ 3,000
2018		8,400
2019		13,600
End of term charge		$ 1,000
Percent of securities in foreign subsidiaries guaranteed to secure debt		65.00%